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These 24 task cards include perimeter questions. Each card includes 2 student answers that your students need to "grade" and determine which answer is incorrect and explain why it is incorrect.
Types of Perimeter Problems include:
➙Finding the perimeter of rectangles with grid lines
➙Finding the perimeter of composite figures with grid lines
➙Finding perimeter of rectangles and composite figures with numbers only
➙Finding the unknown side lengths when given the total perimeter
See if your students understand area well enough to look for others' mistakes. After getting into the habitat of looking for mistakes, hopefully students will learn the importance of double checking their own work.